[TheForge] Re: helical railing calculations

[Bruce Freeman]

Either way.  Whichever works.  I suspect that bending a twisted bar
might either untwist it or further twist it, but I haven't checked that
out yet.

Round rail would be easy - no twisting necessary!  

Or make it of pipe, set the curved pipe up on a custom-designed jig (to
be described some other time), and flatten it (hot?) to a D-shape,
keeping the rounded part upwards on the helix.  Might actually be easy!

Bruce
NJ

>>> crimsonkil at lycos.com 9/23/2004 12:18:54 PM >>>
I thought they were going to twist after they roll the curve.  Kind of
a set in place and tweek to fit sort of thing.


-Chris K

----- Original Message -----
From: Ries Niemi <rniemi at fidalgo.net>
Date: Thu, 23 Sep 2004 08:22:33 -0700
To: mspencer at tallships.ca,Sponsored by ABANA
<theforge at mailman.qth.net>
Subject: Re: [TheForge] Re: helical railing calculations

> 
> Usually, I am a "get out the 24" crescent wrench and the cheater bar"

> kind of guy. As opposed to the integral equation kind of guy.
> So I just yank on it till it looks right, then add enough decorative

> details to distract the eye.
> 
> But one thing I think you theoriticians are getting away from is the

> way real tools work in a real shop.
> And I cannot think of anyway to either "pretwist" a bar to a specific

> pretwist, or to roll a curve in a bar that has been pretwisted. My 
> rolls will easily bend that flat bar the hard way, but in doing so, 
> they will remove any pretwist I had somehow managed to put in. And 
> since short of building a twisting machine as big as my whole shop, I

> can imagine how that pretwist got in there in the first place.
> 
> Otherwise, keep going. I  am reading it, even if I am not fully 
> comprehending it all.
> 
> ries
> 
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